The estimate of the rentable reserves and number of wells required to exploit a reservoir are among the most important variables required to decide on an oil field development.The present paper describes a method to determine both rentable oil thickness and optimum horizontal well spacing in gas oil zones of oil rims with massive gas cap. We propose a techno-economic model of oil rim development that allows expressing Net Present Value as a function of well spacing, filtration and volumetric characteristics of a reservoir, well, infractructure and lifting costs and oil price at wellhead. Basing on the proposed model, we derive dimensionless criteria to determine profitability and optimal horizontal well spacting for oil rims gas-oil zones.

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